Mold for casting rolled-iron finishing-rollers.



Patented Nov. I8, |902.

W. GONTERMANN. MOLD FDR CASTING RDLLED IRON FINISHING RDLLEBS.-

(Application filed July 2, 1901.)

(No Modal.)

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IVALTHER GONTERMANN, OF SIEGEN, GERMANY.

MOLD FDR CASTING ROLLED-IRN FlNISHlNG-ROLLERS.

SPECIFICATION forming part of Letters Patent No. 713,872, dated November 18, 1902.

Application tiled July 2,1901.

To @ZZ whont it ntfty concern:

Beit known that LVALTHER GONTERMANN, a subject of the King of Prussia, residing at 80 Sandstrasse, in the city of Siegen, Kingdom of Prussia, German Empire, have invented a certainnew and Improved Mold for Casting Rolleddron Finishing- Rollers, of which the following is a specification.

The rolled-iron inishing-rollers as heretofore manufactured in clay orvconcrete molds frequently showed the inconvenience of irregular graphite formations separating off in the recesses and grooves of the rollers, which appeared as dark spots on the surface upon the rotation of the rollers. These pieces of graphite drop out of the surface, and thereby spoil the rollers when they are in constant use, necessitating a frequent smoothing and turning off of the same. It is even of frequent occurrence that these irregular formations of graphite are so abundant that the rollers become unfit for use. These drawbacks are avoided in my invention, which is intended to provide a mold by which these irregular formations of graphite are avoided. This is effected in my invention by filling the recessed and grooved parts of the shaping-rollers with iron bricks or small fragments or segments of iron. These are then covered by a thin coating of a mixture of filings or turnings mixed with the necessary binding material, such as graphite, clay, or the like. This coating has the effect of lessening the rapid cooling action of the iron bricks, so as to prevent the formation of a White iron exterior layer in contradistinction to the Well-known method of making hard castings. By the action of this peculiar form of molds the characteristics of the natural Serial No. 66,850. @To model.)

hard iron are retained and the separation of graphite is avoided, which results in the surface of the rollers becoming smoother and denser than has been the case with the rollers manufactured in concrete or clay molds. By this invention the brittleness of hard castings is also avoided.

In the accompanying drawings, Figure lis a longitudinal section of my improved mold. Fig. 2 is a cross-section on line A I3, Fig. l.

The grooves of the mold of the roller are filled with iron bricks a, or with small seg ments of iron, which are then covered With a thin coating l), made from a mixture of iron lings or turnings with a suitable binding agent. After the mold has been thus prepared the rollers are cast, with the result that a perfectly uniform surface is produced upon the roller obtained according to this invention.

In order to allow of contraction of the projectin g parts c in relation to each other, empty joints d, corresponding to the size of the grooves, are left between the iron bricks.

Vhat I claim, and desire to secure by Letters Patent of the United States, is

A mold for casting rolled-iron finishingrollers, said mold having a grooved body, iron bricks Within the grooves, and a coating of iron filings and a binding agent covering the bricks, substantially as specified.

In Witness whereof I have hereunto signed my name in the' presence of two subscribing Witnesses.

WALTHER GONTERMANN.

Nitnessesz CHARLES Ln SIMPLE, KARL SCHMITT. 

